Are you talking about RealD? What is Real3D? RealD is not taking an image and shifting it. All RealD does is take the right eye/left eye and converts it to a format that works better in movie theaters, especially in the front row. They are not into stereo conversion. The don't touch the convergence.
"Disney Digital 3D" is just a marketing term, Disney itself doesn't really have a stereo conversion process They pay other people to do it. Every VFX house does 3D differently, and most Disney movies have at least 2 different houses working on 3D conversion.
I've worked on many Disney films, including Alice in Wonderland and GeForce.